PVP-Regulated Self-Assembly of High-Strength Micrometer-Scale Al/CuO/AP Energetic Microspheres with Enhanced...

Area of Science:

• Materials Science
• Chemical Engineering
• Energetic Materials

Background:

• Aluminum-based nanocomposites offer high energy release for explosives and propellants.
• Practical applications are hindered by poor reliability, stability, and formation challenges.

Purpose of the Study:

• To develop high-strength, high-activity energetic microspheres using a self-assembly method.
• To investigate the role of polyvinylpyrrolidone (PVP) in enhancing mechanical properties.
• To explore the catalytic effect of copper oxide (CuO) in Al/CuO/ammonium perchlorate (AP) systems.

Main Methods:

• Self-assembly of nano-aluminum (Al), copper oxide (CuO), and ammonium perchlorate (AP) using polyvinylpyrrolidone (PVP).
• Systematic investigation of PVP concentration effects on mechanical behavior.
• Replacement of Al with ultrasonically dispersed Al/CuO to study PVP mechanism and CuO catalysis.

Main Results:

• PVP significantly improved interfacial bonding strength in Al/AP composite microspheres.
• Al/AP/5%PVP microspheres showed a 365% strength increase (8.4 MPa at 40% strain).
• Al/CuO/AP/5%PVP microspheres reached 10.2 MPa, a 309% increase over Al/CuO, with enhanced thermal reactivity.

Conclusions:

• A novel method for controlled preparation of high-strength, high-activity energetic microspheres was established.
• PVP acts as a crucial binder, enhancing mechanical properties and stability.
• These microspheres show potential for improving combustion efficiency in solid propellants.